functions.php UPADTE = White Screen of Death

In trying to alter custom credits (which i had added successfully previously), when updating I got the dreaded “white screen of death”

I have no idea why/how this has happened as my code seems the exact same as when it was working previously .
Code below (in a child theme) -There is code at beginning to add a forth widget to footer – the relevant code follows. (I am using Customizr Theme)

I would rather not put the site live until ready as it is for a charity org i am volunteering for, but if needed i can turn off maintenance for whle.

<?php

/* ADD Widget to footer*/

// Adds a widget area. It gets registered automatically as part of the arra
add_filter( 'tc_footer_widgets', 'my_footer_widgets');
function my_footer_widgets( $default_widgets_area ) {
    $default_widgets_area['footer_four'] = array(
          'name'                 => __( 'Footer Widget Area Four' , 'customizr' ),
          'description'          => __( 'Just use it as you want !' , 'customizr' )
    );
    return $default_widgets_area;
}

// Style all the footer widgets so they take up the right space

add_filter( 'footer_one_widget_class', 'my_footer_widget_class');
add_filter( 'footer_two_widget_class', 'my_footer_widget_class');
add_filter( 'footer_three_widget_class', 'my_footer_widget_class');
add_filter( 'footer_four_widget_class', 'my_footer_widget_class');
function my_footer_widget_class() {
    return 'span3';
}

add_filter('tc_credits_display', 'my_custom_credits');
function my_custom_credits(){
$credits = '';
$newline_credits = '';
return '
<div class="span4 credits">
                    <p> &middot; &copy; '.esc_attr( date( 'Y' ) ).' <a href="'.esc_url( home_url() ).'" title="'.esc_attr(get_bloginfo()).'" rel="bookmark">'.esc_attr(get_bloginfo()).'</a> &middot; '.($credits ? $credits : 'Website by <a href="mailto:leonardger@gmail.com">Gerry Leonard</a>').' &middot;'.($newline_credits ? '<br />&middot; '.$newline_credits.' &middot;' : '').'</p>        </div>';
}